/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.optimize;

import proguard.classfile.*;
import proguard.classfile.visitor.MemberVisitor;
import proguard.optimize.info.*;

/**
 * This <code>MemberVisitor</code> delegates its visits to another given <code>MemberVisitor</code>, but only when the
 * visited member has editable optimization info.
 *
 * @see FieldOptimizationInfo
 * @see ProgramFieldOptimizationInfo
 * @see MethodOptimizationInfo
 * @see ProgramMethodOptimizationInfo
 * @author Eric Lafortune
 */
public class OptimizationInfoMemberFilter implements MemberVisitor {
    private final MemberVisitor memberVisitor;
    private final MemberVisitor otherMemberVisitor;

    /**
     * Creates a new OptimizationInfoMemberFilter.
     * 
     * @param memberVisitor the <code>MemberVisitor</code> to which visits will be delegated.
     */
    public OptimizationInfoMemberFilter(MemberVisitor memberVisitor) {
        this(memberVisitor, null);
    }

    /**
     * Creates a new OptimizationInfoMemberFilter.
     * 
     * @param memberVisitor the <code>MemberVisitor</code> to which visits will be delegated if the member has editable
     *        optimization info.
     * @param otherMemberVisitor the <code>MemberVisitor</code> to which visits will be delegated if the member does not
     *        have editable optimization info.
     */
    public OptimizationInfoMemberFilter(MemberVisitor memberVisitor, MemberVisitor otherMemberVisitor) {
        this.memberVisitor = memberVisitor;
        this.otherMemberVisitor = otherMemberVisitor;
    }

    // Implementations for MemberVisitor.

    public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField) {}

    public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod) {}

    public void visitProgramField(ProgramClass programClass, ProgramField programField) {
        MemberVisitor visitor =
            FieldOptimizationInfo.getFieldOptimizationInfo(programField) instanceof ProgramFieldOptimizationInfo
                ? memberVisitor : otherMemberVisitor;

        if (visitor != null) {
            visitor.visitProgramField(programClass, programField);
        }
    }

    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod) {
        MemberVisitor visitor =
            MethodOptimizationInfo.getMethodOptimizationInfo(programMethod) instanceof ProgramMethodOptimizationInfo
                ? memberVisitor : otherMemberVisitor;

        if (visitor != null) {
            visitor.visitProgramMethod(programClass, programMethod);
        }
    }
}
